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What is the condition of an electromagnetic induction?
1) there must be a relative motion between the coil of wire and galvanometer
2) there must be a relative motion between the galvanometer and a magnet
3) there must be a relative motion between galvanometer and generator
4) there must be a relative motion between the coil of wire and a magnet
4) there must be a relative motion between the coil of wire and a magnet